<template>
  <form-item-wrapper :designer="designer" :field="field" :rules="rules" :design-state="designState"
                     :parent-widget="parentWidget" :parent-list="parentList" :index-of-parent-list="indexOfParentList"
                     :sub-form-row-index="subFormRowIndex" :sub-form-col-index="subFormColIndex"
                     :sub-form-row-id="subFormRowId"
                     :in-table-flag="inTableFlag"
                     :column-prop="columnProp"
  >
    <!-- el-upload增加:name="field.options.name"后，会导致又拍云上传失败！故删除之！！ -->
    <el-upload ref="fieldEditor" :disabled="field.options.disabled || isReadMode"
               :action="realUploadURL" :headers="uploadHeaders" :data="uploadData"
               :with-credentials="field.options.withCredentials"
               :multiple="field.options.multipleSelect" :file-list="fileList"
               :show-file-list="field.options.showFileList"
               list-type="picture-card" :class="{'hideUploadDiv': uploadBtnHidden || isReadMode}"
               :limit="field.options.limit" :on-exceed="handlePictureExceed" :on-preview="handlePicturePreview"
               :http-request="httpRequest"
               :before-upload="beforePictureUpload"
               :on-success="handlePictureUpload" :on-error="handleUploadError"
               :before-remove="handleBeforeRemove" :on-remove="handlePictureRemove">
      <template #tip>
        <div class="el-upload__tip"
             v-if="!!field.options.uploadTip">{{ field.options.uploadTip }}
        </div>
      </template>
      <template v-if="!field.options.disabled && !isReadMode">
        <div class="uploader-icon">
          <svg-icon icon-class="el-plus" />
        </div>
      </template>
    </el-upload>

    <div v-if="showPreviewDialogFlag">
      <el-dialog title="" v-model="showPreviewDialogFlag"
                 append-to-body width="60%"
                 :show-close="true" class="drag-dialog small-padding-dialog"
                 :close-on-click-modal="true" :close-on-press-escape="true" :destroy-on-close="true">
        <img :src="previewUrl" style="width: 100%" alt="" />
      </el-dialog>
    </div>
  </form-item-wrapper>
</template>

<script>
import FormItemWrapper from './form-item-wrapper'
import SvgIcon from '@/components/svg-icon'
import emitter from '@/utils/emitter'
import i18n from '@/utils/i18n'
import { deepClone, evalFn } from '@/utils/util'
import fieldMixin from '@/components/form-designer/form-widget/field-widget/fieldMixin'
import request from '@/api'
import XEUtils from 'xe-utils'

export default {
  name: 'picture-upload-widget',
  componentName: 'FieldWidget',  //必须固定为FieldWidget，用于接收父级组件的broadcast事件
  mixins: [emitter, fieldMixin, i18n],
  props: {
    field: Object,
    parentWidget: Object,
    parentList: Array,
    indexOfParentList: Number,
    designer: Object,

    designState: {
      type: Boolean,
      default: false,
    },

    subFormRowIndex: { /* 子表单组件行索引，从0开始计数 */
      type: Number,
      default: -1,
    },
    subFormColIndex: { /* 子表单组件列索引，从0开始计数 */
      type: Number,
      default: -1,
    },
    subFormRowId: { /* 子表单组件行Id，唯一id且不可变 */
      type: String,
      default: '',
    },

  },
  components: {
    FormItemWrapper,
    SvgIcon,
  },
  data() {
    return {
      oldFieldValue: null, //field组件change之前的值
      fieldModel: [],
      rules: [],
      uploadHeaders: {},
      uploadData: {
        key: '',  //七牛云上传文件名
        //token: '',  //七牛云上传token

        //policy: '',  //又拍云上传policy
        //authorization: '',  //又拍云上传签名
      },
      fileList: [],  //上传文件列表
      fileListBeforeRemove: [],  //删除前的文件列表

      previewUrl: '',
      showPreviewDialogFlag: false,
    }
  },
  computed: {
    realUploadURL() {
      let uploadURL = this.field.options.uploadURL
      if (!!uploadURL && ((uploadURL.indexOf('DSV.') > -1) || (uploadURL.indexOf('DSV[') > -1))) {
        let DSV = this.getGlobalDsv()
        console.info('test DSV: ', DSV)  //防止DSV被打包工具优化！！！
        return evalFn(this.field.options.uploadURL, DSV)
      }
      return this.field.options.uploadURL
    },

    uploadBtnHidden() {
      return !this.fileList || (this.fileList.length >= this.field.options.limit)
    },

  },
  beforeCreate() {
    /* 这里不能访问方法和属性！！ */
  },

  created() {
    /* 注意：子组件mounted在父组件created之后、父组件mounted之前触发，故子组件mounted需要用到的prop
       需要在父组件created中初始化！！ */
    this.registerToRefList()
    this.initFieldModel()
    this.initEventHandler()
    this.buildFieldRules()

    this.handleOnCreated()
  },

  mounted() {
    this.handleOnMounted()
  },

  beforeUnmount() {
    this.unregisterFromRefList()
  },

  methods: {
    handlePictureExceed() {
      let uploadLimit = this.field.options.limit
      this.$message.warning(this.i18nt('render.hint.uploadExceed').replace('${uploadLimit}', uploadLimit))
    },

    handlePicturePreview(file) {
      this.previewUrl = file.url
      this.showPreviewDialogFlag = true
    },

    beforePictureUpload(file) {
      let fileTypeCheckResult = false
      if (!!this.field.options && !!this.field.options.fileTypes) {
        let uploadFileTypes = this.field.options.fileTypes
        if (uploadFileTypes.length > 0) {
          fileTypeCheckResult = uploadFileTypes.some((ft) => {
            return file.type === 'image/' + ft
          })
        }
      }
      if (!fileTypeCheckResult) {
        this.$message.error(this.i18nt('render.hint.unsupportedFileType') + file.type)
        return false
      }

      let fileSizeCheckResult = false
      let uploadFileMaxSize = 5  //5MB
      if (!!this.field.options && !!this.field.options.fileMaxSize) {
        uploadFileMaxSize = this.field.options.fileMaxSize
      }
      fileSizeCheckResult = file.size / 1024 / 1024 <= uploadFileMaxSize
      if (!fileSizeCheckResult) {
        this.$message.error(this.$('render.hint.fileSizeExceed') + uploadFileMaxSize + 'MB')
        return false
      }

      this.uploadData.key = file.name
      return this.handleOnBeforeUpload(file)
    },

    handleOnBeforeUpload(file) {
      if (!!this.field.options.onBeforeUpload) {
        let bfFunc = new Function('file', this.field.options.onBeforeUpload)
        let result = bfFunc.call(this, file)
        if (typeof result === 'boolean') {
          return result
        } else {
          return true
        }
      }

      return true
    },

    updateFieldModelAndEmitDataChangeForUpload(fileList, customResult, defaultResult) {
      this.fieldModel = this.fieldModel || []
      let oldValue = deepClone(this.fieldModel)
      if (!!customResult && !!customResult.name && !!customResult.url) {
        this.fieldModel.push({
          name: customResult.name,
          url: customResult.url,
        })
      } else if (!!defaultResult && !!defaultResult.name && !!defaultResult.url) {
        this.fieldModel.push({
          name: defaultResult.name,
          url: defaultResult.url,
        })
      } else if (!!defaultResult && !!defaultResult.data && !!defaultResult.data.name && !!defaultResult.data.url) {
        this.fieldModel.push({
          name: defaultResult.data.name,
          url: defaultResult.data.url,
        })
      } else {
        this.fieldModel = deepClone(fileList)
      }

      this.syncUpdateFormModel(this.fieldModel)
      this.emitFieldDataChange(this.fieldModel, oldValue)
    },

    handlePictureUpload(res, file, fileList) {
      if (file.status === 'success') {
        let customResult = null
        if (!!this.field.options.onUploadSuccess) {
          let customFn = new Function('result', 'file', 'fileList', this.field.options.onUploadSuccess)
          customResult = customFn.call(this, res, file, fileList)
        }

        this.updateFieldModelAndEmitDataChangeForUpload(fileList, customResult, res)
        this.fileList = deepClone(fileList)

        this.$nextTick(() => {
          this.clearValidate()
        })
      }
    },

    updateFieldModelAndEmitDataChangeForRemove(file, fileList) {
      let oldValue = deepClone(this.fieldModel)
      let foundFileIdx = -1
      this.fileListBeforeRemove.map((fi, idx) => {  /* 跟element-ui不同，element-plus删除文件时this.fileList数组对应元素已被删除！！ */
        if ((fi.name === file.name) && ((fi.url === file.url) || (!!fi.uid && fi.uid === file.uid))) {  /* 这个判断有问题？？ */
          foundFileIdx = idx
        }
      })
      if (foundFileIdx > -1) {
        this.fieldModel.splice(foundFileIdx, 1)
      }

      this.syncUpdateFormModel(this.fieldModel)
      this.emitFieldDataChange(this.fieldModel, oldValue)
    },

    handleBeforeRemove(file, fileList) {
      /* 保留删除之前的文件列表！！ */
      this.fileListBeforeRemove = deepClone(fileList)
    },

    handlePictureRemove(file, fileList) {
      this.updateFieldModelAndEmitDataChangeForRemove(file, fileList)
      this.fileList = deepClone(fileList)
      const uploadURL = this.field.options.uploadURL
      request.delete(uploadURL.substring(0, uploadURL.lastIndexOf('/')) + '/' + (file?.response?.data ?? file.uid))

      if (!!this.field.options.onFileRemove) {
        let customFn = new Function('file', 'fileList', this.field.options.onFileRemove)
        customFn.call(this, file, fileList)
      }
    },

    handleUploadError(err, file, fileList) {
      if (!!this.field.options.onUploadError) {
        let customFn = new Function('error', 'file', 'fileList', this.field.options.onUploadError)
        customFn.call(this, err, file, fileList)
      } else {
        this.$message({
          message: this.i18nt('render.hint.uploadError') + err,
          duration: 3000,
          type: 'error',
        })
      }
    },
    httpRequest(options) {
      let formData = window.rawWindow ? new window.rawWindow.FormData() : new FormData()
      formData.append('file', options.file)
      request.post(options.action, formData, {
        headers: {
          'Content-Type': 'multipart/form-data',
        },
        onUploadProgress: (e) => {
          const percent = Math.round((e.loaded / e.total) * 100)
          const process = {
            percent: percent,
          }
          options.onProgress(process)
        },
      }).then(res => {
        options.onSuccess(res, options.file)
      }).catch(err => {
        options.onError(err)
      })
    },
    getValue() {
      if (XEUtils.isArray(this.fieldModel)) {
        if (XEUtils.isObject(this.fieldModel[0]) && this.fieldModel[0].response) {
          return this.fieldModel.map(item => item.response.data)
        } else if (XEUtils.isString(this.fieldModel[0])) {
          return this.fieldModel
        }
      }
    },
  },
}
</script>

<style lang="scss" scoped>
/* form-item-wrapper已引入，还需要重复引入吗？ */

.full-width-input {
  width: 100% !important;
}

.hideUploadDiv {
  :deep(div.ep-upload--picture-card) { /* 隐藏最后的图片上传按钮 */
    display: none;
  }

  :deep(div.ep-upload--text) { /* 隐藏最后的文件上传按钮 */
    display: none;
  }

  :deep(div.ep-upload__tip) { /* 隐藏最后的文件上传按钮提示 */
    display: none;
  }
}

.uploader-icon {
  height: 100%;
  display: flex;
  color: #8c939d;
  font-size: 28px;
  justify-content: center;
  align-items: center;
}

</style>
